QuakeScout
Magnitude6.8

Reviewed by USGSPhilippines109y ago

M6.8 earthquake 19 km ENE of Aras-asan, Philippines

Monday, July 1, 1918, 06:08:35 UTC · 8.945°N, 126.478°E

A magnitude 6.8 earthquake struck 19 km ENE of Aras-asan, Philippines on Monday, July 1, 1918, 06:08:35 UTC, at a depth of 35.0 km (shallow). It is the strongest earthquake within 300 km since an M6.9 on February 7, 1918.

Magnitude
6.8
Strong · mw
Depth
35 km
Shallow
Felt reports
0
Did You Feel It?
Est. shaking
VI
Strong (ShakeMap)
PAGER alert
None
Not issued
Tsunami
No flag
USGS feed

Outlined circle: this earthquakeColoured lines: estimated shaking intensity (USGS ShakeMap)

In context

How big was it, and why here?

Energy released

201 kilotons of TNT

That is about 13 times the Hiroshima bomb. It released about 422 times the energy of a magnitude 5.0.

Tectonic setting

53 km

from the nearest mapped plate boundary, between the Philippine Sea and Sunda plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.

Depth: shallow

35 km

Shallow earthquakes (under 70 km) produce the strongest surface shaking for their size, so they are the ones most likely to cause damage near the epicenter.

Did You Feel It?

Where it was felt

No “Did You Feel It?” reports have been published for this event yet. If you felt it, you can add your report on the USGS website.

I felt it — report to USGS ↗

USGS PAGER estimate

Who was exposed to shaking

USGS publishes PAGER impact estimates for significant earthquakes, usually within an hour. No PAGER estimate is available for this event.

After the main event

Aftershocks within 100 km

USGS has not published any M2.5+ earthquake within 100 km in the 30 days after this event.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 18 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 7.774 km ENE of Barcelona, PhilippinesJuly 12, 1911 · 79 km SE of this epicenter
  2. 7.270 km ENE of La Paz, PhilippinesApril 25, 1913 · 54 km NE of this epicenter
  3. 7.110 km W of Bigaan, PhilippinesJuly 20, 1907 · 77 km SW of this epicenter
  4. 6.94 km ESE of Panikian, PhilippinesFebruary 7, 1918 · 222 km S of this epicenter
  5. 6.616 km E of Cagdianao, PhilippinesApril 24, 1913 · 128 km NW of this epicenter
  6. 6.640 km ENE of Cortes, PhilippinesApril 18, 1913 · 57 km N of this epicenter
  7. 6.642 km E of Aras-asan, PhilippinesOctober 10, 1906 · 27 km SE of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 14 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 4 recorded deaths. The most severe:

  1. 1870

    Mindanao: Davao,Blanco

    4 Nov 1870 · 247 km away

    4 deathsModerate damage ($1–5M)

  2. 1879

    Nw Mindanao: Surigao

    30 Jun 1879 · 143 km away · intensity X

    Extreme damage ($25M+)

  3. 1911M7.8

    Mindanao: Talacogon,Davao,Butuan

    12 Jul 1911 · 53 km away · intensity X

    Severe damage ($5–24M)tsunami

  4. 1871

    Camiguin Island: Mambajao,Catarman

    20 Feb 1871 · 200 km away · intensity IX

    Severe damage ($5–24M)tsunami

  5. 1885

    E Mindanao: Surigao

    22 Feb 1885 · 143 km away · intensity VIII

    Severe damage ($5–24M)

  6. 1903M7.8

    Davao Gulf

    28 Dec 1903 · 223 km away · intensity VIII

    Moderate damage ($1–5M)

NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.

Nearby trackers

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